Portion of an all terrain vehicle



FIG. 1 is a perspective illustration, from the front and left side, of the all terrain vehicle of our design;

FIG. 2 is a perspective illustration, from the rear and left side, of the all terrain vehicle of FIG. 1;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a top view thereof.

In FIGS. 1-7, broken lines showing environment or structure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of an all terrain vehicle, as shown and described. 